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Finding the Fourth Proportional to 485,640.70, 728,482.65 and 165,787.90

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Solution

The fourth proportional to 485,640.70, 728,482.65 and 165,787.90 is: 248,689.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,640.70 : 728,482.65 = 165,787.90 : x
  2. Step 2: Convert to fraction form
    485,640.70/728,482.65 = 165,787.90/x
  3. Step 3: Cross multiply
    485,640.70x = 728,482.65 × 165,787.90
  4. Step 4: Simplify right side
    485,640.70x = 120,773,608,729.94
  5. Step 5: Solve for x
    x = 120,773,608,729.94/485,640.70
  6. Step 6: Final answer
    x = 248,689.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.